1895 - James Edward Keeler measures the motion of Saturn and its rings. He shows that the inner rings move faster than the outer rings. This proves Maxwell right - the rings are made of particles that move separately.
1932 - German astronomer Rupert Wildt discovers that the atmosphere of Saturn contains ammonia and methane.
1979 - The NASA space probe Pioneer 11 flies within 12,000 miles (22,000 km) of Saturn. It also flies by nine of Saturn's moons. The spacecraft sends back images that show the two outer rings. It also gives scientists new information about Saturn's climate, atmosphere, and magnetic field.
